Microchip Technology 24FC01T-I/ST

Overview

24FC01T-I/ST from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 1 MHz clock support at 1.7–5.5 V, and industrial temperature range (−40°C to +85°C). It features 8-byte page write buffer, Schmitt-trigger inputs, and <1 µA standby current-used for configuration storage in embedded controllers and sensor modules.

For engineers reviewing the 24FC01T-I/ST datasheet, 24FC01T-I/ST pinout, 24FC01T-I/ST application, or 24FC01T-I/ST equivalent, key selection criteria include I²C speed compatibility (1 MHz), low-voltage operation down to 1.7 V, write-protect functionality via WP pin, endurance (>1 million cycles), and SOIC-8 packaging suitability for space-constrained PCBs.

Technical Context

The 24FC01T-I/ST implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control. Its internal architecture includes an 8-byte page latch, HV generator for EEPROM programming, and memory control logic that manages self-timed erase/write cycles without external timing constraints.

It supports three read modes-current address, random, and sequential-and uses acknowledge polling to detect write completion. The SDA and SCL pins incorporate Schmitt triggers and input filters (50 ns spike suppression) to ensure robust operation on noisy buses, while output slope control minimizes ground bounce during transitions.

Key Specifications

Pinout & Package

24FC01T-I/ST is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm wide, with standard 1.27 mm pitch. Pin 1 is marked by a notch or beveled corner; the package is RoHS-compliant and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24AA01T-I/ST, the 24FC01T-I/ST delivers 2.5× faster I²C throughput for configuration loads, while AT24C01D-SSHM-T trades industrial-grade reliability for automotive qualification-neither offers pin-to-pin replacement without verifying WP pin behavior and timing margins.

Availability

24FC01T-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, medical device settings backup, and IoT edge node identity storage requiring stable component supply and long-term lifecycle support.

Supply support for 24FC01T-I/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC01T-I/ST belongs to Microchip's 24XX01 family of I²C serial EEPROMs, designed specifically for low-power, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components.

FAQ

What is the maximum I²C clock frequency supported by the 24FC01T-I/ST?

The 24FC01T-I/ST supports up to 1 MHz I²C clock frequency across its full 1.7 V to 5.5 V supply range, unlike the 24AA01T-I/ST (400 kHz max) or 24LC01B (400 kHz, min 2.5 V). This allows faster configuration reads in time-critical boot sequences. The 24FC01T-I/ST maintains full AC timing compliance-including THIGH (260 ns min) and TLOW (500 ns min)-at 1 MHz, making it suitable for high-throughput embedded applications.

How does the WP pin function on the 24FC01T-I/ST?

The WP (Write-Protect) pin on the 24FC01T-I/ST is a dedicated hardware control: when tied to VCC, it disables all write operations to the entire 128-byte memory array (addresses 00h–7Fh), while read operations remain fully functional. When tied to VSS or left floating, normal read/write access is enabled. This feature is implemented at the silicon level and requires no firmware interaction-critical for preventing accidental corruption during system updates. The 24FC01T-I/ST datasheet specifies WP setup/hold times (TSU:WP = 0 ns, THD:WP = 1000 ns) to ensure reliable activation.

What package type is used for the 24FC01T-I/ST?

The 24FC01T-I/ST uses an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm wide, with 1.27 mm lead pitch and industry-standard pinout. This package is designated "ST" in Microchip's part numbering and is compatible with standard SOIC-8 footprints and reflow soldering processes. Unlike DFN or TSSOP variants, the SOIC-8 variant offers ease of prototyping, visual inspection, and hand-soldering capability-making it ideal for industrial control and medical device designs where manufacturability and testability are prioritized.

Does the 24FC01T-I/ST require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC01T-I/ST requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. For 1 MHz operation, Microchip recommends a 2 kΩ pull-up to VCC; for 400 kHz, 10 kΩ is typical. These values balance rise time (TR ≤ 1000 ns) against bus capacitance and drive strength. The 24FC01T-I/ST's internal Schmitt triggers and slope control ensure clean signal edges even with these resistor values, eliminating need for active termination or additional buffering in most embedded designs.

What is the endurance and data retention specification for the 24FC01T-I/ST?

The 24FC01T-I/ST guarantees a minimum of 1,000,000 erase/write cycles and 200 years of data retention at 25°C. Endurance is validated under page-write conditions at 5.5 V and 25°C; retention is specified under accelerated testing per JEDEC standards. These figures apply directly to the 24FC01T-I/ST-not inferred from family-level data-enabling long-term deployment in applications like utility metering or industrial logging where field maintenance intervals exceed 10 years. The 24FC01T-I/ST achieves this using Microchip's proven floating-gate EEPROM process with oxide-nitride-oxide (ONO) tunnel dielectric.